If you're using scenes, you can't p-lock the scene adjustments. but if you plug a MIDI cable from the OT outputs to the OT inputs, and carefully set up the MIDI settings (you will have to work this ot for yourself, but I would turn off everything except CC and check your channel asignments carefully...try this out on a blank project first), then you could use the OT MIDI sequencer to manage both the two scene selections and the position of the crossfader...which means they can be p-locked, controlled with LFOs...!

Likewise, if you have other gear connected to the OT you can use that, eg I typically have the OT sequencing a Nord modular, which in turn is connected tot he MIDI in of the OT

Actually it seems I misunderstood the Ctrl-Al Ram Machine trick, as I don't know Machinedrum. Can anybody explain it ?

From page 108 of the manual...

CTRThe control machines are used to automate and making it easier to control the different parameters of the sixteen available tracks as well as offering control over the stereo master effects. Note that you can use LFO’s alongside the stereo master effect control machines, but not with the other control machines.

CONTROL ALL “CTR-AL”This machine simultaneously controls the chosen parameter or parameters for all 16 tracks. Manipulating one parameter on the CTR-AL machine will affect the corresponding parameter on all 16 tracks. Note that CTRL-AL does not affect the MIDI machines or the SYNTHESIS page of RAM RECORD machines. The functionality of this machine is similar to the [FUNC- TION] + DATA ENTRY knobs operation described on page 37 . The major difference is that using this machine, you can set trigs.